Geanville c



G. C. PRATT.h

CLAY PULVERIZER.

Y (No Model.)

other purposes.

UNITED STATES PATENT OEEICE.

GRANVILLE C. PRATT, OF ANOKA, MINNESOTA, ASSIGNOR OF ONE-HALF TO PETERB. MORSE, OF SAME PLACE;

CLAY-PULVERIZER.

SPECIFICATION forming part of Letters Patent No. 359,630, dated March22, 1887.

Application tiled March 2, 1886. Serial No. 193.720. (No model.)

.To all whom, it may concern:

Beit known that I, GRANVILLE C. PRATT, a citizen of the United States,residing at Anoka, in the county of Anoka and State of Minnesota, haveinvented certain new and useful Improvements in Clay Pulverizers, ofwhich the following is a specification.

My invention relates to machines provided with rotary beaters forreducing and pulverizing clay for the manufacture of bricks and Theeffective operation of machines of this class is frequently interferedwith and machines damagedcby stones and other hard substances introducedinto the machine with the clay and which are caught 'between the beatersand the casing.

It is the principal object of my invention to obviate the difficultyarising from this source, and this object I accomplish by means of themechanism illustrated in the accompanying drawings, in which Y Figure lis a side elevation of the machine; Fig. 2, a top View with the coveringof the machine reuioved5`and Fig. 8, a detail View of a side of thebeaters.

A A are adjoining cylindrical segments, forming the casing of themachine and resting upon `the base B, which is supported on posts b.

A frame work, C, is used to support and stiften the machine. Over theportion A ot the casing may be provided a Xed covering;.

but for a cover of the part A it is preferable to have two'lids, c,pivoted to the frame-work O, and capable of being swung out clear of thecasing.

The part A of the casing is arranged to slide vertically within theframe, so that it can be raised to the position shown in Fig. 1, and itsmovements are guided by the projeetiona from its periphery near thebottom, fitted as a sleeve on the post c'. A notch is made in theprojection a, into which one of the lids c may be made to slide when thehalf-casing is elevated to support the latter. By this arrangement readyaccess can be had to the interior of the machine for inspection orrepairs.

d d are vertical shafts pivoted in the stepboxes d2, and should haveboxes provided at the top of the frame. The shaft d may be driven by apulley, as p, and by means of the gear-Wheels g gwill drive the shaft din the opposite direction.

e e are the beater-arms secured on the shafts d d', preferably in spiralcou-rses. They may be madein sets of four and attached to a sleeve, e',as shown, and fastened to the shaft in any well-known manner; or agreater or less number of arms may be made to project from each of thesleeves, as may be found desirable.

f fare chains connected by means of bolts f in slots in the ends ofthearms or beaters e, and hang loosely from these bolts when the machine is-at rest; but when in operation they are held up to horizontal positionby centrifugal force. They rotate close to the cylinders and overlap atthe middle.

In operating the machine, the beaters being set in rapid rotation, clayis fed through a spout or otherwise into the center of the machine atthetop, and is caught by both'sets of beaters, and is thrown by centrifugalforce to- Ward the casing, to be taken up by the succeeding beaters andcarried around again to the center of the machine. At this point thegreater portion of the substance leaves the beater which first carriedit, to be caught up by the next lower beater of the opposite series, andthe operation thus continues until the material falls from the bottom ofthe machine. A hopper, h, isl fitted to the bottom, and a conveyer, fi,carries away the substance fed to it.

Having fully described my invention, what I claim, and desire to secureby Letters Patent, 1s-

1. In a reducing and pulverizing machine,

GRANVILLE O. PRATT.

Witnesses:

GEo. W.v MORRILL, G. A. STRONG;

